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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba586b26f43740ec49465b602bb7b8e16b7b05e7912cd70ae220fd0bf9c00b1' 
  AND token = '64kMhQgevp+1URjK+WCb+zaiHHo+lHltjnfNwank5XM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}